KeyError: key not found: :sast

https://sentry.gitlab.net/gitlab/gitlabcom/issues/2674956/?referrer=gitlab_plugin

KeyError: key not found: :sast
  lib/gitlab/ci/yaml_processor/result.rb:115:in `fetch'
    job = jobs.fetch(job_name)
  lib/gitlab/ci/yaml_processor/result.rb:115:in `yaml_variables_for'
    job = jobs.fetch(job_name)
  app/services/security/ci_configuration/sast_parser_service.rb:118:in `extract_required_attributes'
    yaml_result.yaml_variables_for(:sast).each do |variable|
  app/services/security/ci_configuration/sast_parser_service.rb:112:in `build_sast_attributes'
    extract_required_attributes(yaml_result)
  app/services/security/ci_configuration/sast_parser_service.rb:99:in `gitlab_ci_yml_attributes'
    build_sast_attributes(config_content)
...
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